A program that allowed users to draw on a screen wITh a {light pen}. IT supported constraints (e.g. drawing a constrained ellipse produced a circle). IT also had some {computer aided design} features (e.g. computing loads on beams). Sketchpad was the subject of Ivan E. Sutherland' s 1963 MIT PhD thesis, which opened the field of computer graphics. IT was the progenITor of computer drawing packages like MacDraw or Adobe Illustrator. There is a film of Sketchpad in action. IT solved constraints using value inference and introduced the "ring" list structure. ["Sketchpad: A Man-Machine Graphical Communication System", I.e. Sutherland, MIT Lincoln Lab, TR 296 (Jan 1963)]. [Sammet 1969, p. 678]. (1995-02-14)